'Watchman' in the Bible

Meanwhile, Absalom had run away. While the young man standing watch was looking around, all of a sudden he observed many people coming down the road behind and to the west of the mountain! So the watchman left his post and reported, "I have seen men coming from the direction of Horonaim."

Meanwhile, David was sitting between the inner and outer gates of the city. The watchman was up on the roof of the gateway near the walls, looking around, and there was a man running by himself!

So the watchman called out his news to the king.

The king responded, "If he's alone, he's bringing some news to report." As the man continued to draw near and approach the palace, the watchman observed another man running. So he called out to the gatekeeper, "There's another man running by himself!" The king replied, "He's also bringing some news to report!"

Then the watchman observed, "It looks to me that the runner out in front is running like Zadok's son Ahimaaz!" The king replied, "This is a good man bearing good news!"